Enclosed direct lighting fixtures



Jan. 24, 1956 v. s. wlNcE 2,732,482

ENcLosED DIRECT LIGHTING FIXTURES Filed Nov. 14. Isx

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United States Patent C 2,732,582. ENCLOSED DIREC'IEIGH'IING FIXTURES Vearl S. Wince,.l\,ewarlr,V` Ohio', assignorf-tol Holophane Company, Inc., New York Nt Y.. a; corporation of Delaware The present inventionrelates'torenclosed directy lighting fixtures and is more particularly directed toward" such fixtures characterized-by` tightness" against dust and/or vapors. Insuch tight iixtures; it i's/ essential' that, when in use, the interiorof the ii'xtureformingthe lamp receiving chamber be effectively sealed to prevent' passage of' dust, air or gas-*into or'out of the' chamber, yet the fixture must be openable` at willlfor relampingand clean ing; It is thereforefnecessary to` prevent leakageatL the entrance for the wiringandl at the-joii1ttwherethelxtnre chamber is opened.

The present inventioni contemplates that theV socket' used to support the-lamp inthe lamp chamberA will be sealed so that gas cannot pass` through it andv that the socket will be mounted ony thesupporting' hood in: suchV a. manner as' to preventleakageL of 1 gases from the wiring' chamber and wiring system conduit past the socket either way.

According to the presentiirventio'n, the lowerA part of the fixture isr` providedi wtl'r a light` transmitting, pret`- erably transparent bottom, and arelletor for, directing the light down through the transparent` bottonr. rlhese light handling parts are securedtill gasf tight relation: and they are in.. turn secured to a mounting' ring to form a preassembled; unit, which unit can. besecured tofthe supportingr hood or body in dust and gas2 tight relation; with it, or detached, as desired.

Where the reilectorandl lightY transmitting bottom are of glass; these partsv andthe. ring. be heldtogether by a. sheetzinetalA cover or shield` which: also protects: the reflector. A portion of this sheet metal cover may also provide a surface which bears against a gasket between it and the hood.

The accompanying drawings show, for purposes of illustrating the present invention, one embodiment in which the invention may take form, it being uderstood that the drawings are illustrative of the invention rather than limiting the same.

In the accompanying drawings:

Figure 1 is a vertical sectional view with parts in elevation, showing the completely assembled luminaire;

Figure 2 is a fragmentary side elevation of one of the latches used to secure the lower part of the iixture to the hood;

Figure 3 is a fragmentary vertical section at an enlarged scale; and

Figure 4 is a reduced scale illustration of the detachable reflector and cover assembly suspended from the fixed hood or body.

The body or hood of the fixture or luminaire is illustrated at in the form of a bell-shaped casting. It has an internally threaded boss 11 at the top for securement to the pipe and is provided with an apertured partition 12 slightly below the boss. A gas tight lamp socket 13 is secured to the under face of the partition 12 by any suitable means here shown in the form of an apertured, dished plate 14, screws 15 and gaskets as indicated at 16 and 17, This arrangement avoids the use of screws bear- 2,732,482 Patented Jan. 24, 1956.

ing directly against the porcelain body of" the lampV socket. Theupper end ofthesockethasthe usual wiring terminals, one of which appears at 18; and theL lower endof4 the socket has the usual socket` terminals 19 and 20 for cooperationwithv thebasev of thev lamp bulb B.

The lower end of the casting 10, as indicated in the drawings has an, inwardly extending flange 21 with a hat lower face and ispreferably recessed as indicated at 22 to-support a captive` asbestos gasket 23; The casting10 is provided with two outwardly' extending lugs 24.

BelowA the above described, normally fixed, hood or body-with lamp socketVl attached, is al separable preassembled unitwhich forms, wheninplace,a1completelyclosed chamber about the lamp; This unit includes a downwardly and' outwardlyflaring reflector R and a light transmittingV bottom T. TheseA are ordinarily made of glass. The joint between thetransmitter T and reiiector R is sealed bythe gasket indicated at 32I and a protective gasket 33 is placed about the upper'end' of the reflector. A sheet metal cover 34" about the reector has a lower edge 35 which engages the llange on the lightv transmittingv cover` and a shoulder asA indicated at 36 and bears` against the gasket 33. A portion of the cover 34 indicated: at 37 extends upwardly inside a ring 33. ThisV ring hasV a downwardly facing ange 39l bearing on theY cover` above gasket 33, and a skirt 40. To provide' a preassembledV unit, sheet metal coverv 34 is secured to the reflector, light transmitting cover and the'V ring. This is preferably accomplished by Hanging the cover as indi cated at 41* sothat' it bears. on= thev upper dat surface 42 of' the ring 38V.

The` ring 38" is provided with outwardly extending` lugs` 43; 43 which carry" latch levers 44 provided with spring loops 45 which enga-ge over theV tops of the lugs 43; WhenV the latch devices" are in the position indicated in Figure l, the flangeA 41= on the sheet metal cover is held tightlyagainst they gasket 23 andthe lamp chamber securely sealed.

The hood 1t) and one of the loops 45 are connected together by a chain, 46 so that wheny the latches are released, the reflector cover assemblyr may be, suspended belowA the-'fixed hood orbody'asA shown in Figure 4, so thatl the lamp` bulb B is` accessible for'renlova-l` and replacement; The small reector' 47 may, if desired, be carried-=from1 the-ange- 2'1; of'the hood byspring-clips 4S.

Since itis'obvious` that theY invention may beY embodied in other forms and constructions within the scope of: the claims, I Wish it to be understood that the particular form shown is but one of these forms, and various modifications and changes being possible, I do not otherwise limit myself in any way with respect thereto.

What is claimed is:

l. A lighting fixture tight against dust and/or vapor comprising a downwardly opening canopy provided above its mouth with an upper, annular bearing surface and carrying a pendant lamp socket, means securing the socket against said bearing surface to form an upper vapor tight chamber impervious to vapor so that vapor cannot pass through the canopy between the upper bearing surface and the socket or through the socket, the canopy having at its mouth a lower, downwardly facing annular bearing surface, an annular, impervious sheet metal cover having an upwardly facing bearing surface opposite the second bearing surface of the canopy and of relatively smaller diameter than the lower portion thereof, a rigid collar outside the smaller diameter portion of the cover and to which the cover is secured against relative movement in any direction, a gasket between said bearing surfaces of like diameter, disconnectible means carried by the canopy and collar for forcing said latter mentioned bearing surfaces toward one another to form with the interposed gasket a tight joint for preventing the entrance of dust or vapors and for permitting separation to permit access to the lamp socket, and an impervious, light transmitting bottom permanently sealed to the bottom of the metal cover so as to form together therewith the lower part of a tight chamber below the lamp socket.

2. A lighting fixture such as claimed in claim 1, wherein the metal cover is outwardly flanged onto the upper surface of the collar and bears directly against the gasket.

3. A lighting fixture such as claimed in claim l, having tixedly secured inside the metal cover below the collar and above the light transmitting bottom an annular, downwardly and outwardly flaring glass relicctor.

4. A direct lighting fixture tight against dust and/or vapors, comprising two separable units one above the other which when held together form a lamp chamber and when separated permit relamping, and wherein the upper unit includes a supporting canopy and a sealed vapor tight lamp socket opening into the chamber, and wherein the lower unit includes a downwardly and outwardly flaring reiector, a glass closure for the bottom of the retiector, a metal reflector cover engaging the edge of the glass closure and bearing against the top of the recctor to secure the reflector and bottom closure together, and a collar above the upper end of the reector, the cover extending between the collar and reiiector and being secured to the collar to hold it against the outer surface of the cover, gasket means intermediate the canopy and collar, and releasable devices carried by the collar and canopy for clamping the lower unit against the upper' unit.

5. A lighting fixture tight against dust and/or vapor, comprising a canopy provided with an upper downwardly facing annular ange and carrying a pendant lamp socket, the said upper flange and socket being sealed vapor tight so that vapor cannot pass through the canopy or socket, the canopy having a lower, inwardly extending annular ange, an annular impervious sheet metal cover having its upper end in the form of an outwardly extending ange of the same diameter as the canopy auge and below the said canopy flange, a collar outside the cover immediately below the cover ange, a gasket between the anges opposed canopy and cover, means carried by the canopy and collar for forcing the canopy and cover flanges toward one another to form a tight joint for preventing the entrance of dust or vapors, and an impervious light transmitting bottom sealed to the bottom of the cover so as to form a tight chamber below the lamp socket.

6. A direct lighting fixture tight against dust and/or vapor, comprising a pendent, normally iixed canopy having an apertured partition wall, a vapor tight lamp socket having a body extending through the apertured wall, wiring terminals on the upper end and lamp socket terminals on the lower end so as to carry a lamp pendent, means to secure the socket in place to prevent flow of vapor through the partition wall, the canopy also having a downwardly facing circular ange and an annular gasket supported by the canopy and bearing against the iiange, and a detachable assemblage including a downwardly acting reliector, an imperforate light transmitting bottom, a collar above the upper end of the reector, and a metal cover having its lower end fitted about the periphery of the light transmitting bottom and extending upwardly about the reiiector and inside the collar and secured to the collar to hold the collar, reflector and light transmitting bottomk together, and clamping devices carried by the canopy and collar for clamping the detachable assemblage against the said gasket and forming a tight chamber for the lamp.

7. A sub-assembly for use in dust and vapor tight lighting apparatus comprising an inverted annular, domeshaped glass retiector, a glass bottom whose edge iits against the mouth of the reflector, a gasket about the joint between the reector and bottom, a second gasket about the small diameter end of the reector, a spun sheet metal cover having a lower iiange engaging the edge of the bottom and a downwardly facing shoulder bearing on the second gasket and an upwardly extending portion above the shoulder, and a stiffening collar through which said upwardly extending portion of the cover extends and onto the top of which it is outwardly tianged.

References Cited in the tile of this patent UNITED STATES PATENTS 988,824 Sagendorph Apr. 4, 1911 1,043,256 Schepmoes Nov. 5, 1912 1,075,612 Tregoning Oct. 14, 1913 1,393,075 Boyton et al Oct. 11, 1921 1,614,121 Halvorson, Jr. Ian. 11, 1927 2,170,871 Niemann Aug. 29, 1939 FOREIGN PATENTS 843,157 France Mar. 20, 1939 920,547 France Jan. 4, 1947 

